Description

Silane, Chlorotrimethyl-, Hydrolysis Products With Silica is a specialized organosilicon compound resulting from the hydrolysis of chlorotrimethylsilane in the presence of silica. This material is engineered to provide a hydrophobic, organically modified silica surface, which is critical for enhancing compatibility and performance in composite and polymer systems. It is primarily utilized by manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as in advanced material science for surface modification and filler treatment.

Application

• Hydrophobic Filler for Polymers: Used to treat silica and other mineral fillers to impart hydrophobicity, improving dispersion and mechanical properties in silicone, epoxy, and polyurethane composites.
• Reinforcing Agent in Elastomers: Acts as a coupling agent in rubber formulations, enhancing the bond between inorganic fillers and the organic polymer matrix for improved tensile strength and abrasion resistance.
• Surface Modification Agent: Applied to glass, metals, and pigments to create water-repellent and organophilic surfaces for coatings and inks.
• Adhesive and Sealant Formulations: Improves adhesion to difficult substrates and enhances the moisture resistance of sealants and adhesives.
• Rheology Modifier: Used to control the flow and sag resistance of paints, coatings, and gel coats by modifying filler-polymer interactions.
• Pharmaceutical and Cosmetic Additive: Functions as a glidant or anti-caking agent in powder formulations, improving flow properties due to its hydrophobic nature.

Basic Information

Product Name	Silane, Chlorotrimethyl-, Hydrolysis Products With Silica
CAS No.	71889-01-5
Molecular Formula	Complex mixture; based on (CH3)3SiCl and SiO2
Molecular Weight	N/A (Variable polymeric product)
Synonyms	Hydrophobic Silica; Treated Fumed Silica; Trimethylchlorosilane Hydrolysis Products with Silica; Silica, reaction products with chlorotrimethylsilane; Hydrophobic amorphous silica; TS-720 (analogous treated silica); HDK® H20 (analogous); AEROSIL® R972 (analogous treated fumed silica); Organosiloxane-modified silica
EINECS	Contact for details

Quality Control

Our production of Silane, Chlorotrimethyl-, Hydrolysis Products With Silica adheres to stringent quality management protocols. Each batch is characterized for critical parameters such as degree of hydrophobicity, specific surface area, and carbon content to ensure consistent performance as a surface modifier and reinforcing filler. Certificates of Analysis (COA) detailing these specifications are available upon request, supporting your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. This material is hygroscopic (moisture-sensitive). Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep the container tightly sealed when not in use to prevent moisture absorption, which can affect product performance.

Specification

Item	Specification
Appearance	White, free-flowing powder
Hydrophobicity (Water Wetting Test)	Completely hydrophobic
Loss on Drying	< 1.5 %
pH (in 4% aqueous dispersion)	3.5 - 6.5
Carbon Content	1.0 - 5.0 %
Specific Surface Area (BET)	90 - 130 m²/g
Tamped Density	30 - 60 g/L
SiO2 Content (on ignited basis)	> 98.0 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.